Range of a function

Test Preparation SAT Preparation
1

<p>Hey guys,
can you please tell me what exactly is the range of a fuction ,and please give me some examples because i reallly cant understand it.I know what is the domain ,though</p>

2

<p>Range is what can the Y be.
for example, in the function f(x) = √x , the range of the function would be y≥0 since the squareroot of a number cannot be negative (the SAT will never ask about imaginaries)
for the function f(x) = x+2 the range of the function is all real numbers because the answer can be anything
if they draw a graph, then the range of the function would be lowest y value of a point ≥ biggest y value of a point.
for the function f(x) = x^2 +4 4, then the range of the function would be y ≥ 4 because if u substitute lets say 3 for f(x), then you will get x^2 = -1, which is imaginary and not on the SAT./</p>

3

<p>Like the above poster said, the range deals with what the Y values are on the graph, while the domain is just the X values.</p>

4

<p>SO ,in general, the domain and the range of a function must be equal or biggar than 0 ,if the function is f(x) = 5sqrtX ,for example ?</p>

5

<p>Yep. 10char</p>